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xu,¢,6 Brown: Mount Banahao’s Podocarpus Imbricatus 395 
trees, would be expected to grow slower than trees, which are 
now larger, did when they were 5 to 10 centimeters in diameter. 
It will be seen, therefore, that the age of a 10-centimeter tree 
cannot be calculated with any considerable degree of accuracy 
from the present figures. Most of the trees with diameters 
greater than 10 centimeters are in the main canopy so that any 
error, due to the fact that some of these may not reach larger 
sized classes, is probably very small. 
Age in years. 
60 (20 180 240 300 360 » 420 480 
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Diameter in centimeters. 
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Fic. 1. Rates of growth of Podocarpus imbricatus on Mount Banahao and of pines in the 
United States. 
In fig. 1 are also shown curves for loblolly pine* in South 
Carolina, white pine* in New York, long-leaf pine* in South 
Carolina, and yellow pine ‘ at an altitude of 2,650 meters in New 
Mexico. It will be seen at a glance that the growth of all of these 
species is very much more rapid than that of Podocarpus imbri- 
catus and that the difference between the rates of growth of the 
fastest and the slowest growing of these temperate zone species 
is very much less than the difference between the rate of growth 
of yellow pine, which shows the slowest growth, and that of 
Podocarpus imbricatus. Podocarpus imbricatus when 50 centi- 
meters in diameter appears to be 2.4 times as old as yellow pine 
* Graves, H. S., and Ziegler, E. A., The woodman’s hand book, Bull. U. S. 
Forestry Service 36 (1910) 189-190. 
*From data collected by Mr. O. F. Bishop in the Carson National Forest 
in 1911. 
